<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>03_执行上下文栈</title>
</head>
<body>
	<script type="text/javascript">
	      function test(){
	      	var a=0;
	      	console.log(++a);
	      }
	      test();
	      test();
	      test();
	      test();
	      test();
	      test();
	      test();
	</script>
</body>
</html>